Arm chair



FIG. 1 is a rear perspective view of an arm chair showing my design;

FIG. 2 is a three-quarter side perspective view thereof;

FIG. 3 is a front elevational view of the arm chair of FIG. 1;

FIG. 4 is a rear elevational view of the chair of FIG. 1; and

FIG. 5 is a top plan view of the arm chair of FIG. 1. 

The ornamental design for an arm chair, as shown. 